Meaning of MEDIASTINUM in English


— mediastinal , adj.

/mee'dee a stuy"neuhm/ , n. , pl. mediastina /-a stuy"neuh/ . Anat.

1. a median septum or partition between two parts of an organ, or paired cavities of the body.

2. the partition separating the right and left thoracic cavities, formed of the two inner pleural walls, and, in humans, comprising all the viscera of the thorax except the lungs.

[ 1535-45; mediastinus of middle class, appar. identical with L mediast ( r ) inus a low-ranking slave, perh. deriv. of medius MID 1 , though sense and formation unclear ]

Random House Webster's Unabridged English dictionary.      Полный английский словарь Вебстер - Random House .